The Training Range Environmental Evaluation and Characterization System (TREECS ) is currently under development by the Army with varying levels of capability. TREECS forecasts the fate of munitions constituents (MC), such as high explosives (HE), within firing/training ranges; it also forecasts the risk of MC transport from surface water to groundwater. The overall objectives are to provide environmental specialists with tools to assess the potential for migration of MC into surface water and groundwater systems and to assess range management strategies for protecting human and environmental health. The MC fate models within TREECS require hydrologic information as input. A hydrology model was developed to estimate these inputs. This model has been revised several times during the course of TREECS development. Although portions of several reports have documented parts of this hydrology model, this report was needed to consolidate the latest version of the model within a single report. The model uses a modified version of the Soil Conservation Service curve number method to compute daily runoff using daily rainfall. Snow build-up and melt is accounted for by using daily precipitation and daily average and maximum air temperatures. Potential evapotranspiration is computed using the Thornthwaite Method. Infiltration is computed from a water balance.

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